How to fix a while condition so it does not execute do part non-stop

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Problem is that the program continues to ask for height even in the case where a number between 1 and 8 is entered. I am also having difficulty understanding why I need to restate "int height" after the while loop, but that's a side issue.

{
   do
   {
    int height = get_int("Height: \n");
   }
   while ('h'>8 || 'h'<1);

  int height;

  printf ("Stored: %d\n", height);
}

I expect that it presents the number entered to the user, but it doesn't get past requesting for input, despite the conditions in the while function.

In your condition:

while ('h'>8 || 'h'<1)

'h' is a character constant. It has nothing to do with the variable height. You're comparing this constant against 8 and 1. In ASCII, the code for 'h' is greater than 8, so the condition will always be true.

Also:

int height = get_int("Height: \n");

Having height declared inside of the loop means it ceases to exist outside of the loop, which include the loop conditional. The height you define later is a different variable than this one.

Move the definition of height outside of the loop, and use height in the comparison:

int height;
do
{
    height = get_int("Height: \n");
} while (height>8 || height<1);

printf ("Stored: %d\n", height);

Loops: while and for, Any expression or variable can be a loop condition, not just The loop will first execute the body, then check the condition, and, while it's Let's examine the for statement part-by-part: Instead, it stops the current iteration and forces the loop to start a new one (if No break/continue to the right side of '?'. The "While" Loop . A "While" Loop is used to repeat a specific block of code an unknown number of times, until a condition is met. For example, if we want to ask a user for a number between 1 and 10, we don't know how many times the user may enter a larger number, so we keep asking "while the number is not between 1 and 10".

'h' is a constant. In ASCII it will always have an integer value of 104. So 'h' > 8 will always be true.

As for your second question. The height variable defined inside of the do-while loop is in a different scope. A new height is created at the start of each iteration and destroyed at the end of each iteration.

Defining height before the loop will make it accessible inside of and after the loop.

int height = 0;
do {
    height = get_int("Height: \n");
} while (height > 8 || height < 1);
printf("Stored: %d\n", height);

Try looking at C's scope rules for more details.

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do
{
   int height = get_int("Height: \n");
}
while ('h'>8 || 'h'<1);

the test is a constant expression, 'h'>8 is always true and 'h'<1 always false, so the test is always true, there is no reason the do while stops

note : int height is a local variable only existing in the do block


int height;

printf ("Stored: %d\n", height);

you print a non initialized variable


move the int height; before the do while and replace int height = get_int("Height: \n"); by height = get_int("Height: \n");, and of course replace the test to check height value

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your test inside the while is never changing and is always true, the compiler is referring to 'h' as a char and is converting it to its ASCII code that is 104 (which is always greater than 8). the while in this code is for the compiler always like while (104 > 8 || 104 < >);. Also, you don't have to restate the int height;, the height variable is already declared.

you can change your code for something like:

{

do {
   int height = get_int("Height : \n");
} while ( height > 8 || height < 1);

printf ("Stored: %d\n", height);

}

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You should declare variable int high outside. Like this

Problem is that the program continues to ask for height even in the case where a number between 1 and 8 is entered. I am also having difficulty understanding why I need to restate "int height" after the while loop, but that's a side issue.

{

int height; do

{

height = get_int("Height: \n");

}

while ('h'>8 || 'h'<1);

printf ("Stored: %d\n", height);

}

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Comments
  • 'h' is an integer constant which is usually greater than 8
  • What is get_int()
  • Change 'h' to height (without quotes)
  • The condition is tautologously true. Replace single quotes with nothing and h with height.
  • Thanks very much. Your note about declaring it outside the loop is also very helpful.
  • @Nahom Glad I could help. Feel free to accept this answer if you found it useful.